Add stream to premium backers [ci skip] (#4249)

Author: tomchristie

README.md

@@ -18,15 +18,16 @@ REST framework commercially we strongly encourage you to invest in its
 continued development by **[signing up for a paid plan][funding]**.
 
 The initial aim is to provide a single full-time position on REST framework.
-Right now we're a little over 50% of the way towards achieving that.
+Right now we're over 58% of the way towards achieving that.
 *Every single sign-up makes a significant impact.*
 
 <p align="center">
   <a href="http://jobs.rover.com/"><img src="https://raw.githubusercontent.com/tomchristie/django-rest-framework/master/docs/img/premium/rover-readme.png"/></a>
   <a href="https://getsentry.com/welcome/"><img src="https://raw.githubusercontent.com/tomchristie/django-rest-framework/master/docs/img/premium/sentry-readme.png"/></a>
+  <a href="https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf"><img src="https://raw.githubusercontent.com/tomchristie/django-rest-framework/master/docs/img/premium/stream-readme.png"/></a>
 </p>
 
-*Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Rover](http://jobs.rover.com/) and [Sentry](https://getsentry.com/welcome/).*
+*Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Rover](http://jobs.rover.com/), [Sentry](https://getsentry.com/welcome/), and [Stream](https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf).*
 
 ---
 

docs/img/premium/rover-readme.png

@@ -68,16 +68,17 @@ REST framework commercially we strongly encourage you to invest in its
 continued development by **[signing up for a paid plan][funding]**.
 
 The initial aim is to provide a single full-time position on REST framework.
-Right now we're a little over 50% of the way towards achieving that.
+Right now we're over 58% of the way towards achieving that.
 *Every single sign-up makes a significant impact.*
 
 <ul class="premium-promo promo">
     <li><a href="http://jobs.rover.com/" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/rover_130x130.png)">Rover.com</a></li>
     <li><a href="https://getsentry.com/welcome/" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/sentry130.png)">Sentry</a></li>
+    <li><a href="https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/stream-130.png)">Stream</a></li>
 </ul>
 <div style="clear: both; padding-bottom: 20px;"></div>
 
-*Many thanks to all our [awesome sponsors][sponsors], and in particular to our premium backers, [Rover](http://jobs.rover.com/) and [Sentry](https://getsentry.com/welcome/).*
+*Many thanks to all our [awesome sponsors][sponsors], and in particular to our premium backers, [Rover](http://jobs.rover.com/), [Sentry](https://getsentry.com/welcome/), and [Stream](https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf).*
 
 ---